sample.java

import java.util.Scanner;

public class Student {
    private String name;
    private float mark;

    public static void main(String[] args) {
        Scanner stInput = new Scanner(System.in);
        System.out.print("Enter number of students:\n");
        int num = stInput.nextInt();
        stInput.nextLine();
        Student[] stGp = new Student[num];

        // info input
        for (int i = 0; i < num; i++) {
            System.out.print("Enter name and mark:\n");
            stGp[i] = new Student();
            stGp[i].name = stInput.nextLine();
            stGp[i].mark = stInput.nextInt();
            stInput.nextLine();
        }

        // average mark
        float sum = 0;
        for (Student aSt : stGp) {
            sum = sum + aSt.mark;
        }
        float average = sum / num;
        System.out.print("The average mark is " + average + "\n");

        // get the highest mark and name
        float highest = stGp[0].mark;
        String highestName = "";
        for (Student aSt : stGp) {
            if (aSt.mark > highest) {
                highest = aSt.mark;
                highestName = aSt.name;
            }
        }
        System.out.print("The highest mark and student is " + highestName + " " + highest + "\n");

        // list who above average
        System.out.print("Students whose mark scoring above average:\n");
        for (Student aSt : stGp) {
            if (aSt.mark >= average) {
                System.out.print(aSt.name + "\n");
            }
        }
    }
}